Repair of HP42S in NYC area

[rwsh76]

Hello !
I don't know if I'm a bit late on this post. But take a look at the troubleshooting appendix in the manual.
You will see the following workaround that works with almost all (if not any) calculator of the Pioneer series : Short briefly the battery contacts with a coin or a paperclip then put the batteries on again.
Hoping it will be useful to you if you didn't already solve your issue !
Best regards.